sedimentary
Sandstone (with Siltstone/Greywacke variations)
Sedimentary Rock (Clastic)
Hardness: 6-7 Mohs; Color: Gray, tan, or greenish-gray; Luster: Dull/Earthy; Crystal structure: Granular clastic; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Gray, tan, or greenish-gray
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Gray, tan, or greenish-gray; Luster: Dull/Earthy; Crystal structure: Granular clastic; Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) usually in marine or river environments over millions of years.
Uses & applications
Commonly used in construction, road aggregate, and as building stone. While not used in fine jewelry, smooth river-worn specimens are popular for garden landscaping and craft painting.
Geological facts
Sandstone makes up about 10-20% of the Earth's sedimentary rock crust. This specific specimen appears water-worn, likely from a riverbed or coastal area.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible layering or bedding planes. Frequently found in riverbeds, canyons, and mountainous regions with sedimentary history.
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